ES2374033T3 - COOKING DEVICE. - Google Patents

Abstract

Cooking device with at least two heating units (24.1, 24.2, 24.3; 24.4) that jointly fix a related cooking zone (14) of a cooking plate (12), and a power device (28) that it is provided for the power supply of the heating units (24.1, 24.2, 24.3; 24.4), characterized in that the power device (28) has a differentiating unit (36) which is intended for, in a differentiated heating mode with at least two heating units (24.2, 24.3), differentiate a first positive heating power (H'2) for a first heating unit (24.2) from a second positive heating power (H'3) for a second unit heating (24.3).

Description

Cooking device

The invention relates to a cooking device according to the preamble of claim 1.

From EP 0 376 760 A a cooking device with at least two heating units is known which together set a related cooking zone of a cooking plate, and a power device that is intended for power supply of the heating units.

The task of the invention consists in particular in making available a cooking device according to the gender with improved characteristics in relation to the result in the preparation of a meal.

The task is solved according to the invention by means of the features of claim 1, while from the dependent claims advantageous configurations and improvements of the invention can be extracted.

The invention relates to a cooking device with at least two heating units that jointly fix a related cooking zone of a cooking plate, and a power device that is intended for the power supply of the heating units .

It is proposed that the power device has a differentiating unit that is intended to, in a differentiated heating mode with at least two heating units, differentiate a first positive heating power for a first heating unit from a second positive heating power for a second heating unit. In this way, advantageous results can be achieved in the preparation of a dish. In particular, a power distribution adapted to a geometry of a preparation battery can be achieved in cooking areas that tend to the cooking zone. By a heating mode " with " At least two heating units must be understood in particular one mode of operation for heating a preparation battery placed in the cooking zone laid by the heating units, which is carried out by at least two heating units. The heating units can be supplied simultaneously and / or successively in this mode of operation. However, it is advantageous that the power device is provided in the differentiated heating mode for the simultaneous supply of the heating units. In addition, it must be understood as a heating power "for" a heating unit, in particular a heating power delivered to the heating unit or to be delivered to the heating unit. It must also be understood as a "positive heating power" a heating power that is greater than zero watts.

In a preferred embodiment of the invention, it is proposed that the cooking device has at least three heating units and that the differentiated heating mode is a heating mode with at least three heating units, through which one can achieve a especially flexible use of a cooking zone laid by the heating units. Especially high flexibility can be achieved in adapting an operation of the cooking device to the dimensions of a preparation battery if the cooking device has at least four heating units and the differentiated heating mode is a heating mode with the minus four heating units.

In addition, it is proposed that the cooking device has at least three heating units arranged concentrically with each other and that the differentiating unit is provided for, in the differentiated heating mode, to differentiate a first positive heating power for a first unit of external heating of a second positive heating power for a second external heating unit, through which particularly advantageous preparation results can be achieved.

For a "concentric" arrangement of at least two heating units with respect to each other, an arrangement of at least two heating units in which a first heating unit surrounds at least essentially a second heating unit is especially understood. In this case, a first heating unit surrounds a second heating unit "at least essentially" if the first heating unit surrounds the second heating unit especially around at least 200 °, advantageously around at least 270 ° and, preferably, around at least 340 °. Advantageously, the first heating unit surrounds the second heating unit completely. In a set of concentric heating units, it is called a heating unit that surrounds at least essentially at least one other heating unit heating unit "outside". A heating unit that is at least essentially surrounded by all other heating units in the assembly, that is, not at least essentially surrounding any other heating unit, is called the "central" heating unit. A heating unit that surrounds at least essentially all other heating units of the assembly, that is, that is not at least essentially surrounded by any other heating unit, is called the "outermost" heating unit. The heating units may in this case have a circular shape, a spiral shape, an elliptical shape, an annular shape and / or another shape that is convenient for the expert. In a concentric arrangement of at least three heating units, it should be understood as a heating unit "intermediate" especially an outdoor heating unit that is at least essentially surrounded by at least one other heating unit. An intermediate heating unit is essentially surrounded by at least the outermost heating unit.

In a preferred embodiment of the invention, it is proposed that the power device be provided to provide by means of the differentiating unit a minimum positive heating power to an intermediate heating unit. In this way, an especially advantageous temperature distribution can be achieved in a heated preparation battery base.

In an advantageous development of the invention, it is proposed that the power device has a first power unit for the supply of at least two heating units and a second power unit different from the first power unit that is intended for the supply of at least a third heating unit. By using at least two power units, a simultaneous operation of at least two heating units can be achieved in a particularly advantageous manner, through which expensive and perceptible connection processes can be avoided during a cooking operation.

In this context, the convenience of use can be further increased if the first power unit is provided for the simultaneous supply of at least two heating units. For a simultaneous "supply" of two heating units, in particular, a supply is to be understood in which each of the heating units is simultaneously supplied with a heating power in at least one time interval.

Likewise, it is proposed that the cooking device has at least three heating units arranged concentrically with each other and that the first power unit is provided for the supply of at least two external heating units, through which You can get a circuit topology adapted advantageously to the configuration of the cooking zone.

An embodiment of the differentiated heating mode with a simple topology can be achieved if the first power unit is provided for, in the differentiated heating mode, to supply differentiated positive heating powers to at least two heating units by the differentiating unit.

In another embodiment, it is proposed that the differentiating unit has at least one connection means that is intended to connect in the differentiated heating mode at least one of the heating units optionally with the first or the second power unit, through of which particularly high flexibility and high power values can be achieved.

The first heating power and the second heating power can represent constant power values in the differentiated heating mode. In an embodiment of the differentiated heating mode, they can be variable over time. In this context, for the achievement of an advantageous temperature distribution it is advantageous if the differentiating unit has a differentiating means that is intended to predetermine a fixed relationship at least in the differentiated heating mode between the first and second heating power. A fixed connection between the first and second heating power can be achieved through the differentiating means. In this case, it can be achieved that, in case of a temporary variation of the first heating power, the second heating power varies proportionally to the first heating power, the constant proportionality factor remaining over time.

An especially simple and economical embodiment of the differentiating unit can be achieved if the differentiating unit has a differentiating means that is configured as a condenser.

A differentiation of the power can be achieved in a simple way in terms of construction if the differentiating unit has a differentiating means that is connected at least in the differentiated heating mode in series with at least one heating unit.

A power device with a high application flexibility and a compact construction can be achieved, if the differentiating unit has a differentiating means and a connecting means that is provided for a connection and disconnection of the differentiating means.

Likewise, it is proposed that the differentiating means be arranged in a branch that bridges the connecting means, through which an especially simple embodiment of the differentiating unit can be achieved. In this case, the differentiating means can be disconnected easily by means of a short circuit generated by the connection means.

It is also advantageous if the differentiating unit has at least one other differentiating means that is pre-connected to the connection means, through which power relations especially advantageous in the realization of a differentiated heating mode with great flexibility can be achieved. A differentiating medium is here "preconnected" to the connection means if an electric current that leaves a power unit and flows in the direction

of at least one heating unit to which power is to be supplied reaches the differentiating means before of the connection means.

In an advantageous improvement of the invention, it is proposed that the power device has a unit of power with a bridge topology, and that the differentiating unit comprises a differentiating medium that is connected on a bridge branch of the power unit, through which a topology of the Especially simple circuit.

A particularly advantageous automatic adaptation to the geometry of a preparation battery can be achieved which must be heated if the cooking device has a control unit that is intended to operate a connection of the differential heating mode depending on a covering state of at least one heating unit For this, the cooking device is advantageously provided with a sensor means that It is in effect connection with the control unit and is intended for the acquisition of a degree of coverage of at least one heating unit. If the cooking device is provided with a set of at least three heating units arranged concentrically with each other, the control unit is provided with advantageous way to activate the differentiated heating mode depending on a covering state of the outermost heating unit.

Other advantages are taken from the following description of the drawings. Examples of embodiment of the invention. The drawing, description and claims contain numerous features in combination. The expert will consider the characteristics appropriately also individually and will gather them in Other reasonable combinations.

It shows:

Fig. 1 an induction cooking field with four cooking zones in a view from above, Fig. 2 the induction cooking field in a sectional view, Fig. 3 an induction cooking circuit with heating units, power units and

a differentiating unit, Fig. 4a a heating operation of a cooking zone with two powered cooking areas, Fig. 4b the configuration of the circuit of Fig. 3 in the heating operation of Fig. 4a, Fig. 4c a battery of preparation in the cooking zone in the heating operation of Fig. 4a, Fig. 5a a heating operation of the cooking zone with three driven cooking areas, Fig. 5b the circuit configuration of Fig. 3 in the operation of heating of figure 5a, fig. 5c a preparation battery in the cooking zone in the heating operation of figure 5a, fig. 6 a control unit, a sensor means and a means for connecting the induction cooking field , Fig. 7 a special embodiment of the circuit of Figure 3, Fig. 8 another embodiment of the circuit of Figure 3 with a capacitor preconnected to two units of

heating,

Fig. 9 an alternative circuit to the embodiment of Figure 3 with an optionally connectable capacitor, postconnected to a heating unit, for reducing the power of the heating unit,

Fig. 10 the circuit of Figure 3 with a capacitor connected next to another heating unit, Fig. 11 another variant of the circuit of Figure 3, Fig. 12 another embodiment with a differentiating unit that is provided with two relays, Fig. 13 another embodiment with a differentiating unit that is provided with three relays, Fig. 14 another embodiment with an optional connection of two power units, Fig. 15 a variant embodiment of the circuit of Fig. 14 with different branch points, Fig. 16 a variant embodiment of the circuit of Fig. 14 with three relays, Fig. 17 another variant embodiment of a connected topology, Fig. 18 another variant embodiment of a connected topology in the realization of a heating mode

nominal, Fig. 19 the embodiment of figure 18 in the embodiment of a heating mode " Superboost " (super

reinforcement), in which a connection to other power units is established, Fig. 20 a variant embodiment of the topology of Figure 18 with an additional relay, Fig. 21 a cooking zone with four concentric cooking areas, Fig .22 an induction cooking circuit with four heating units that are

assigned to the cooking areas, with a topology according to the embodiment of Figure 3, Fig. 23 the circuit of Figure 22 with a topology according to the embodiment of Figure 11, Fig. 24 the circuit of Figure 22 with a topology according to the embodiment of figure 12 and fig. 25 the circuit of figure 22 with a topology according to the embodiment of figure 13.

Figure 1 shows a cooking device 10 configured as an induction cooking field in a top view. It has a cooking plate 12 configured as a ceramic plate for the preparation of preparation batteries. The surface of the cooking plate 12 comprises four cooking zones 14, 16, 18, 20, each of which corresponds to a related partial area of the cooking plate, suitable for heating a preparation battery. To this end, the cooking zones 14, 16, 18, 20 each cover at least one heating unit of the cooking device 10 in the vertical direction upwards (see Figure 2). The cooking zones 14 to 20 are each configured circularly. The cooking device 10 also has a control unit 22 that is intended for starting, stopping and / or setting a heating mode through a user.

In this text, the terms " vertically ", " up ", etc. they refer to the position of the cooking device 10, in which it is controlled by an end user under conditions of use as prescribed.

Figure 2 shows the cooking device 10 in the area of the cooking zone 14 in a sectional view along a line II-II of Figure 1. The cooking zone 14 covers a set of three units heating 24.1, 24.2, 24.3 in the vertical direction upwards. The heating units 24 are each configured as induction coils that are provided in a known manner for the stimulation of ohmic losses at the base of a preparation battery placed in the cooking zone 14. In an alternative embodiment of the cooking device 10 , the heating units 24 can each be configured as heating resistance. The heating units 24 are arranged concentrically with each other and tend to the related cooking zone 14. Here, two external heating units 24.2, 24.3 surround a central heating unit

24.1. An outermost heating unit 24.3 surrounds the central heating unit 24.1 and an intermediate heating unit 24.2 which is arranged radially in the cooking zone 14 between the central heating unit 24.1 and the outermost heating unit 24.3. The heating units 24 each have a cooking area 26 different from the cooking zone 14. The cooking areas 26 are arranged concentrically with each other. An outermost cooking area 26.3 covers the outermost heating unit

24.3 in an upward vertical direction and surrounds an intermediate cooking area 26.2 and a central cooking area 26.1. The intermediate cooking area 26.2 covers the intermediate heating unit 24.2 in the upward vertical direction and surrounds the central cooking area 26.1, which covers the central heating unit 24.1 in the upward vertical direction. The intermediate cooking area 26.2 is therefore arranged in the radial direction of the cooking zone 14 between the central cooking area 26.1 and the outermost cooking area 26.3. The central cooking area 26.1, which encloses the central point of the cooking zone 14, is circularly configured. The intermediate cooking area

26.2 extends annularly around the central cooking area 26.1, and the outermost cooking area 26.3 extends annularly around the intermediate cooking area 26.2 (see also Figure 1). The cooking areas 26 border on each other, so that they form a related cooking zone 14. In an advantageous embodiment, the cooking areas 26 may have, by way of example, the following dimensions: the cooking area

26.1 may have a diameter of 210 mm, the cooking areas 26.1 and 26.2 may together form a circular zone with a diameter of 260 mm, and the cooking areas 26.1 to 26.3 may correspond together with a zone that has a 320 mm diameter.

Figure 3 shows a circuit of the cooking device 10. This circuit presents the heating units 24.1, 24.2, 24.3 and a power device 28, which is intended for the power supply of the heating units 24. The power device 28 has two power units 30, 32, each of which is configured as a converter. Here, the power units 30, 32 each have connection elements 34 configured as a transistor that, in a known manner, generate from a rectified voltage, which in the drawings is designated with the reference symbol V, an alternating current for feeding to heating units

24. The connection elements 34 are configured, for example, as IGBT (insulated-gate bipolar transistor or bipolar transistor with insulated gate electrode). Other connection elements 34 that are reasonable for the expert are thinkable. A first power unit 30 is provided for power supply of the external heating units 24.2 and 24.3. The power unit 30 and the heating units 24.2, 24.3 are arranged in a bridge topology, the heating units 24.2 and 24.3 being arranged in a common bridge branch. In addition to the power unit 30 and configured separately from the power unit 30, a power unit 32 is provided for the power supply of the central heating unit 24.1. The power device 28 has a differentiating unit 36, the mode of operation of which is described below in more detail. The differentiating unit 36 has a differentiating means 38 configured as a condenser. The differentiating unit 36 may optionally also present other differentiating means 39, which in Figure 3 are schematically represented by a rectangle. A rectangle each time represents an impedance value, which can be given through another capacitor, an inductivity, a resistor or by a combination thereof. In Figs. 7 and 8 two special embodiments of the circuit of Fig. 3 are depicted. As extracted from a comparison of Figs. 3 and 7, a rectangle can also represent a short circuit in Fig. 3. The power unit 30, the differentiating unit 36 and the heating units 24.2, 24.3 are arranged in a bridge topology. The heating units 24.2, 24.3 and the differentiating unit 36 are arranged here on a bridge branch of the bridge topology. The bridge branch has a central line L1, which joins the power unit 30 between two connecting elements 34. The central line L1 is divided into two parallel branches, each of which is arranged one of the units of heating 24.2, 24.3. The parallel branches are unified in a central line L2 that is connected to a capacitor branch between two capacitors C2, which are connected with the connection elements 34. The differentiator unit 36 further comprises a connection means 40, which may be configured by example as a relay, and which is used to connect the central line L1 optionally with one of the parallel branches of the bridge branch. The differentiating means 38 configured as a condenser is arranged in a branch 42, which connects the central line L1 with the branch in which the heating unit 24.2 is arranged, and here it bridges to the connection means 40, so that the central line L1 is permanently electrically connected to this branch through the differentiating means 38. The power unit 32 and the heating unit 24.1 are also arranged in a bridge topology with a bridge branch, in which the power unit is connected heating 24.1. The bridge branch is connected to the power unit 32 between two connection elements 34 and to a capacitor branch between two capacitors C1, which are connected with the connection elements 34.

By means of the power device 28, and especially through the connection means 40 of the differentiating unit 36, at least two heating modes can be carried out for the actuation of the cooking zone 14. This is described by means of Figures 4a, 4b, 5a and 5b.

In a first heating mode, to the central heating unit 24.1 and the intermediate heating unit

24.2 heating power is supplied simultaneously. Here, to the central heating unit

24.1 a first positive heating power H1 is supplied by the power unit 32. The intermediate heating unit 24.2 is supplied with a heating power H2 by the power unit 30, while the heating unit 24.3 remains inactive. This is represented in Figures 4a and 4b. In Figures 4a and 5a, a striped cooking area corresponds each time to a cooking area that covers an activated heating unit. In this case, the connection means 40, which is configured as a relay for example, is brought to a connection position shown in Figure 4b, in which a current circuit comprising exclusively the heating unit 24.2 is closed. This is formed by the heating unit 24.2, one of the capacitors C2, a connection element 34 and, if necessary, by another differentiating means 39.1 and / or 39.2. The connection established by the connection means 40 of the central line L1 with the branch of the heating unit 24.2 constitutes a short circuit with respect to the branch 42, so that electric current flows exclusively through the connection means 40 to the unit heating 24.2 or heating unit 24.2. The differentiating means 38 is here in a disconnected state. In the connection position of the connection means 40 shown in Fig. 4b, a current circuit is also enclosed that encloses the outermost heating unit 24.3, through which the heating unit 24.3 is in an un-activated state.

A second heating mode, also called differential heating mode, is described by means of Figures 5a and 5b. As extracted from Figure 5a, the differentiated heating mode corresponds to a heating mode with the three heating units 24.1 to 24.3. In the differentiated heating mode, heating units 24.1 to 24.3 are supplied with heating power simultaneously. The power unit 32 generates a positive heating power H'1 for the central heating unit 24.1. In the differentiated heating mode, the external heating units, and indeed the intermediate heating unit 24.2 and the outermost heating unit 24.3, are supplied with heating power by the power unit 30 together and simultaneously . A positive heating power H'2 is supplied to the intermediate heating unit 24.2 and a more positive heating power H'3 is supplied to the outermost heating unit 24.3. In the connection position of the connection means 40 shown in Figure 5b, the differentiating means 38 is in a connected state, being connected in series with the heating unit 24.2 through the branch 42. As extracted from a comparison of 4b and 5b, the connection means 40 serves to switch between a first topology, in which the differentiating means 38 is disconnected, and a second topology, in which the differentiating means 38 is connected. In the configuration of Figure 5b, the connection means 40 closes a current circuit arranged in the bridge branch, which has the differentiating means 38 and the heating units 24.2, 24.3.

The differentiating means 38 of the differentiating unit 36 serves to differentiate the positive heating powers H'2 and H'3 from each other in the differentiated heating mode. The power device 28 is especially provided for supplying the intermediate heating unit 24.2 lower heating power H'2 with respect to the heating power H'3 by means of the differentiating unit 36: with the aid of the differentiating means 38, which in The differentiated heating mode is configured as a condenser connected in series with the heating unit 24.2, the intermediate heating unit 24.2 is supplied with the heating power H'2, which is less than the heating power H'3, with which the outermost heating unit is supplied 24.3. The differentiating means 38 here predetermines a relationship between the heating power H'3 of the outermost heating unit 24.3 and the heating power H'2 of the intermediate heating unit 24.2, which remains fixed during the realization of the mode of differential heating. This relationship can also be established by choosing the impedance values of the other differentiating means 39. The relationship remains during the realization of the differentiated heating mode, and in fact independent of the total power delivered by the power unit 30. In an alternative embodiment variant, it is thought that the differentiating unit 36 has a differentiating means 38 that is configured as a variable capacitor.

Figures 4c and 5c correspond to the sectional view of figure 2, a preparation battery 46 (figure 4c) or 48 (figure 5c) being placed respectively in the cooking zone 14. As extracted from these figures, the heating modes described above are suitable for heating preparation batteries of different dimensions. In the example of FIG. 4c, a preparation battery 46 is placed in the cooking zone 14, whereby the base of the preparation battery covers the central cooking area 26.1 and the intermediate cooking area 26.2, and the device Power 28 is actuated in the first heating mode. In the example of Figure 5c, the preparation battery base of a preparation battery 48 covers the three cooking areas 26.1 to 26.3, whereby the power device 28 is operated in the heating mode differentiated with the three units heating 24.1 to 24.3.

The differential heating mode is connected dependently on a covering state of the outermost heating unit 24.3. This is described by means of Figure 6. Figure 6 shows a circuit of the cooking device 10 in a schematic view. The connection of the differential heating mode takes place by means of a control unit 50, which is in effect connection with the connection means 40 of the differentiating unit 36. The control unit 50 is also in effect connection with a sensor means 52 , which is intended to capture a degree of coverage of a heating unit, and indeed in this example especially the outermost heating unit 24.3. The sensor means 52 can be for example an inductive medium. The sensor means 52 may correspond in particular to the heating unit 24.3 configured as an induction coil. In this case, by means of a magnetic field stimulated by the heating unit 24.3, it is possible to check if the cooking area 26.3 is covered by an appropriate preparation battery for inductive cooking operation. If this is recognized, then a command signal is transmitted by the control unit 50 to the connection means 40, which drives the connection means 40. Here, the connection means 40 is brought to the connection position shown in the Figure 5b, in which the differentiating means 38 is connected and the heating units 24.2, 24.3 are each operated with a different heating power. Through the fact that in the differentiated heating mode the intermediate heating unit 24.2 is operated with a heating power H'2 less than the heating power H'3 of the outermost heating unit 24.3, a distribution of the uniform temperature at the preparation battery base of the preparation battery 48. This results from the fact that the outer edge of the preparation battery 48 feeds a decrease in heat, through which the edge area of the battery Preparation 48 requires a heating power greater than the intermediate area. In the differentiated heating mode, the outermost heating unit 24.3 and the central heating unit 24.1 can be operated with an equal heating power H'1 = H'3.

Figures 7 to 24 show circuit embodiments of the cooking device 10, which are used for supplying the heating units 24. Basically, the description of Figures 1 to 7 is applicable for these following embodiments. In order to avoid repetitions, only the differences with respect to the embodiment of Figure 3 are described below, if necessary. For the components that remain the same, no new reference symbols are given.

Figure 7 shows a special embodiment of the circuit of Figure 3. In this embodiment, the differentiating unit 36 exclusively comprises the differentiating means 38, which is also indicated as capacitor Cmed and the connecting means 40. By way of example, they are The following values can be considered for the individual functional components: C1 = 720 nF, C2 = 720 nF and Cmed = 90 nF. In the example considered, the heating power H'2 is supplied to the intermediate heating unit 24.2 by means of the differentiating means 38, which corresponds to 30% of the total heating power generated by the power unit 30, while that the heating power H'3 is supplied to the outermost power unit 24.3, which corresponds to 70% of the total heating power generated by the power unit 30. Other values of the heating powers H ' 2 and H'3 that are reasonable to the expert are thinkable.

In Fig. 8, another embodiment of the circuit of Fig. 3 is shown. In this case, the differentiating means 39.1, which is preconnected to the connecting means 40 in the bridge branch, and in fact in particular in the central line L1, and which is connected in series with the parallel branches of the heating units 24.2, 24.3, is configured as a capacitor C3. The following circuit configuration is thinkable: C1 = 720 nF, C2 = 720 nF, Cmed = 90 nF and C3 = 1440 nF. Here and throughout the text, the terms "preconnected" and "postconnected" they refer to a direction given by a current path in the bridge branch starting from the connection elements 34 in the direction of the capacitors C2. The differentiating means 39.1 is arranged before the bypass point of the branch 42, so that it is assigned to both heating units 24.2, 24.3, while the differentiating means 38, which is arranged in the branch 42, is assigned to the unit heating 24.2.

Figure 9 shows an alternative embodiment of the circuit of the cooking device 10. In comparison to the embodiment of Figure 7, the differentiating unit 36 is connected next to the heating units 24.2, 24.3. In this case, the differentiating unit 36 is connected to the central line L2, and is arranged between the parallel branches with the heating units 24.2, 24.3 and the condenser branch with the capacitors C2. The branch 42 joins the branch of the heating unit 24.2 directly with the center line L2 and bridges the connection means 40.

Figure 10 shows another embodiment of a circuit, in which the differentiating unit 36 as in Figure 9 is also postconnected to the heating units 24.2, 24.3. In comparison with figure 9; the differentiating unit 36 additionally has a differentiating means configured as capacitor C3. This is arranged in the parallel branch that is assigned to the heating unit 24.3, and is connected to the heating unit 24.3. In this example, the following values of the individual functional components are advantageous: C1 = 720 nF, Cmed = 90 nF, C2 = 540 nF and C3 = 1080 nF.

Another embodiment of a circuit is shown in Figure 11. Here, the differentiating unit 36 corresponds to the embodiment of Fig. 3, with the difference that the differentiating means 38 is renounced. In the example shown, the branching of the heating unit 24.2 is permanently electrically connected to the line central L1 and, through this, with the power unit 30. The differentiating unit 36 presents in the shown embodiment a connection means 53 which is arranged in the branch assigned to the heating unit 24.3, and serves for the connection and disconnection of the heating unit 24.3. This connection means 53, which can be configured for example as a relay, is arranged after the branch branch point assigned to the heating unit 24.2, so that this branch is permanently connected to the line L1 and, through of this, with the power unit 30. The ratio of the heating powers H'2 and H'3 in the differentiated heating mode of the heating units 24.2 and 24.3 is given by choosing the values of the differentiating means 39.1, 39.2 and 39.3. Here, these values are chosen such that the heating power H'2 in the differentiated heating mode is less than the heating power H'3.

It is also possible to think of another embodiment that is represented in figure 12. This corresponds to the embodiment of figure 11, with the difference that in the branch assigned to the heating unit 24.2 there is also a connection means 53.1 configured for example as relay The connection means, which is used for the connection and disconnection of the heating unit 24.3, and which is already seen in Figure 11, is indicated here with the reference symbol 53.2. The connection means 53.1, 53.2 serve to separate the heating units 24.1, 24.2 from the center line L1. In addition, a connection line L3 is provided which serves to connect in series with one another the heating units 24.2, 24.3, if both heating units 24.2, 24.3 are separated from the central line L1. As in the embodiment of Figure 11, the ratio of the heating power H'2 and H'3 in the differentiated heating mode is given through the dimensioning of the differentiating means 39.1 to 39.3.

Figure 13 shows another embodiment of the circuit that essentially corresponds to the embodiment of Figure 12. Additionally, on the connection line L3 another connection means 53.3 is provided which serves to optionally interrupt the connection line L3.

Figures 14 to 20 show other embodiments of a circuit for the cooking device 10, in which the power units 30 and 32 are connected to each other.

The embodiment according to Fig. 14 essentially corresponds to the embodiment of Fig. 11. In the example shown, the circuit has the differentiating characteristic that another connecting means of the differentiating unit is arranged in the branch assigned to the heating unit 24.2. 36, for example in the form of a relay. This connection means is indicated in the figure with the reference symbol 55, while the other connection means which, as in Figure 11, is arranged in the branch assigned to the heating unit 24.3, is still indicated with the symbol reference 53. The connection means 55 serves to switch between a first configuration, in which the heating unit 24.2 is connected to the central line L1, and a second configuration, in which the heating unit 24.2 is connected to the power unit 32. The connection with the power unit 32 occurs through a line that is derived from the bridge branch on which the heating unit 24.1 is arranged, the bypass point being pre-connected to the heating unit

24.1. The differentiation in the heating powers H'2 and H'3 in the differentiated heating mode can, as described above, be determined by choosing the dimensioning of the differentiating means 39. In addition, alternatively or additionally, the Differentiation can be achieved through the fact that heating units 24.2 and 24.3 are supplied with power through a different power unit 32 or 30, the power units 30, 32 for example having a different nominal power. This principle of differentiation with the aid of differentiating means 39 and / or connection means 55 sized specifically for the optional connection of at least one heating unit 24.2 and / or 24.3 with different power units 30, 32 can be implemented with different topologies, as shown in the embodiments of figures 15 to 17.

In Fig. 15 another embodiment is observed that is supported by the topology shown in Fig. 11. The circuit according to Fig. 15 differs from the embodiment according to Fig. 11 through the branching assigned to heating unit 24.2 being arranged another means of connection, indicated in the figure with the reference symbol 55, connected next to the heating unit 24.2. This connection means 55 serves to switch between a first configuration, in which the heating unit 24.2 is connected to the central line L2, and a second configuration, in which the heating unit 24.2 is connected to the bridge branch in which is arranged the heating unit 24.1. The connection with this bridge branch occurs through a line that is derived from the bridge branch, the branch point connected to the heating unit 24.1 being connected.

Another embodiment is shown in Figure 16. This differs from the embodiment according to Figure 14 by a different functionality of the connection means 53, as well as by an additional connection means. The connection means 55 of Figure 14 is indicated in Figure 16 with the reference symbol 55.1, while the additional connection means is indicated with the reference symbol 55.2. The connection means 53 serves to switch between a first configuration, in which the heating unit 24.3 is connected to the central line L1, and a second configuration, in which the heating unit 24.3 is connected to a connection line L3 . This connection line L3 connects the connection means 53 with the connection means 55.2. This optionally enables a connection of the line L3 with the power unit 32. Through a joint action of the connection means 53 and 55.2 three configurations are possible: the heating unit 24.3 is connected through the center line L1 with power unit 30; the heating unit 24.3 is separated from both power units 30, 32 and, through this, disconnected; The heating unit 24 is connected through the connection line L3 and the connection means 55.2 with the power unit 32. With the topology shown, both heating units 24.2 and 24.3 can optionally be connected with the power unit 30 or with power unit 32.

Figure 17 shows another embodiment. In this case, the differentiating unit 36 has a single connection means 55, which is connected next to the heating unit 24.3. By means of the connection means 55, the heating unit 24.3 can be disconnected, or it can be connected through a line, which is derived from the bridge branch of the heating unit 24.1 at a branch point connected after the heating unit 24.1, with this heating unit 24.1. Heating unit

24.2 is permanently connected to power unit 30.

Another alternative embodiment is shown in Figure 18. The differentiating unit 36 has a differentiating means 39.3 configured as a condenser C3, which is arranged in the branch assigned to the heating unit 24.3. The differentiating means 39.3 is especially pre-connected to the heating unit 24.3. In this branch, a connection means 53.1 is also arranged, whereby the heating unit 24.3 is connected to the central line L1 in the case of a differentiated heating mode, or it can be separated from the central line L1. In this central line L1 another connection means 55.1 is arranged. Through this connection means 55.1 a first configuration can be achieved, in which the parallel branches of the heating units 24.2, 24.3 are connected to the power unit 30, and a second configuration, in which the heating unit 24.1 is connected to power units 30 and 32 and power can be supplied through them. A connection line L3 is derived from the central line L1, whereby a connection with a circuit 54 shown in Figure 19 can be established through a connection means 53.2 arranged in line L3 and shown in figure 19. A connecting means 55.2 is also arranged on the central line L2. Optionally, the heating units 24.2, 24.3 can be connected by means of connection 55.2 with the condenser branch having the capacitors C2 or with another connection line L4, by which a connection with a circuit 54 can be established shown in figure 19, as shown in figure 19.

Figure 18 shows the circuit in a differentiated heating mode with all heating units 24.1 to 24.3, this heating mode being configured as the so-called "nominal" heating mode, in which the powers delivered to the heating units 24 they are limited by the nominal powers of the power units 30, 32. In this heating mode, the heating units 24.2, 24.3 are supplied with power by means of the configuration shown of the connection means 53.1, 53.2, 55.1, 55.2 by the power unit 30 in a usual jumper configuration, the partial circuits with the power units 30, 32 being separated from each other.

Figure 19 shows a circuit, as well as two other circuits 54, 56 in the realization of a differentiated heating mode with all heating units 24.1 to 24.3, this heating mode being configured as the so-called "heating mode" Superboost ' . In this heating mode, the heating units 24.2, 24.3 are connected with other power units 58, 60 of circuits 54, 56, while both power units 30 are used to supply the heating unit 24.1, 32. Through this, a higher power can be achieved in this heating mode than in the nominal heating mode. The circuits 54.56 have other heating units 62, 64 that are not used in the realization of the heating mode "Superboost", as well as power units 58, 60 for the supply of these heating units 62, 64, separating in heating mode " Superboost " the heating units 62, 64 by means of connection of their assigned power unit 58 or 60 respectively, and these power units 58, 60 serving for the supply of the heating units 24.2, 24.3.

A variant of the embodiment of Figure 18 is shown in Figure 20. In comparison with the embodiment according to Figure 18, another connecting means 55.3 is arranged in the branch assigned to the heating unit 24.2 preconnected to the heating unit 24.2 . It optionally joins the heating unit 24.2 with the central line L1 or joins the heating unit 24.2 with the power unit 32 through a line derived in the bridge branch of the heating unit 24.1 before the heating unit heating 24.1. With this circuit you can perform, as described above, a heating mode " nominal " and a heating mode " Superboost ".

An alternative embodiment of the cooking zone 14 is shown in Figure 21. This comprises the concentric cooking areas 26.1 to 26.3 described above. Additionally, the cooking zone 14 has another cooking area 26.4, which is concentric to the other cooking areas 26.1 to 26.3 and surrounds them. This cooking area 26.4 covers a heating unit 24.4 not shown in more detail in Figure 21, which surrounds under the cooking plate 12 the other heating units 24.1 to 24.3. In this embodiment, the heating unit 24.4 is configured as the outermost heating unit, and the heating units 24.2 and 24.3 are considered as intermediate heating units. Different embodiments of circuits including these heating units 24.1 to 24.4 are shown in Figures 22 to 25.

Figure 22 shows a first embodiment of a circuit presenting the heating units 24.1 to 24.4. To these two power units 66, 68 are assigned, which form the power device 28. In this embodiment, heating units distanced from one another are assigned to a common power unit: to the central heating unit 24.1 and the unit The intermediate heating unit 24.3 is supplied with power by the power unit 66, while the intermediate heating unit 24.2 and the outermost heating unit 24.4 are supplied with power by the power unit 68. The power units 66, 68 each have a pair of connection elements 34. The partial circuit comprising the power unit 66 and the heating units 24.1, 24.3 has a topology corresponding to the realization of the partial circuit assigned to the heating units 24.2, 24.3 according to figure 3. Here, the heating units 24.1, 24.3 are arranged on a bridge branch that connects to a branch of co capacitor with two capacitors C1. The other partial circuit, comprising the power unit 68 and the heating unit 24.2, 24.4, has an identical topology. The values of the functional components in the partial circuits may be identical or different. The power device 28 has a differentiating unit 36. This is distributed between two partial differentiating units 36.1, 36.2. These partial differentiating units 36.1, 36.2 are each arranged on a bridge branch of the partial circuits, and each corresponds in their embodiment to the topology of the differentiating unit 36 of Figure 3.

By differentiating unit 36, based on the functional principle of partial differentiating units 36.1, 36.2, which is not repeated here, two differentiated heating modes can be achieved. A first differential heating mode can be operated with three heating units 24.1, 24.2, 24.3, in which the central heating unit 24.1 and the innermost intermediate heating unit 24.2 are operated with a heating power H'1 and H '2 respectively, and the outermost intermediate heating unit 24.3 is driven with a heating power H'3, which is greater than the heating powers H'1, H'2. These powers H'1, H'2 can be identical or they can be different from each other. This is conditioned by the dimensioning of the differentiating means 39.1 to 39.3 in the respective partial differentiating units 36.1, 36.2. In this first differential heating mode, the outermost heating unit 24.4 remains disconnected by a corresponding configuration of the connection means 40 of the partial differentiating unit 36.2. Likewise, another differentiated heating mode can be activated with four heating units 24.1 to 24.4. For this, the connection means 40 of the partial differentiating unit 36.2 is actuated, so that the outermost heating unit 24.4 is connected to the power unit 68. In this differentiated heating mode, the heating unit 24.4 is activated with a heating power H'4, which is greater than the heating powers H'1, H'2. The heating powers H'3 and H'4 can be identical or different from each other. This is conditioned by the choice of dimensioning of the differentiating means 39.1 to 39.3 in the respective partial differentiating units 36.1, 36.2. By way of example, the values of the functional components of the partial differentiating units 36.1, 36.2 may be identical in the partial circuits, while the values of the capacitors C1 and C2 in the partial circuits are advantageously different. The connection of the outermost heating unit 24.4 takes place as for the heating unit 24.3 by means of a sensor means for capturing a covering state of the heating unit 24.4 not shown in more detail, and in joint action with the heating unit. sensor 50 that drives the connection means 40 of the partial differentiating unit 36.2.

The circuits shown in Figures 23 to 25 differ from the embodiment shown in Figure 22 by the realization of the partial differentiating units 36.1, 36.2.

In Figure 23, the partial circuits are provided with a partial differentiating unit 36.1, 36.2, which corresponds to the realization of the differentiating unit 36 according to Figure 11. In Figure 24, the partial differentiating units 36.1, 36.2 are configured according to the embodiment of figure 12, while the use of partial differentiating units 36.1, 36.2 according to the embodiment of figure 13 is shown in figure 25.

Reference symbols

10 Cooking device 12 Cooking plate 14 Cooking zone 16 Cooking zone 18 Cooking zone 20 Cooking zone 22 Control unit 24 Heating unit 26 Cooking area 28 Power device 30 Power unit 32 Power unit 34 Element connection 36 Differentiating unit

36.1 Partial Differentiating Unit

36.2 Partial differentiating unit 38 Differentiating medium 39 Differentiating medium 40 Connection medium 42 Bypass 44 Condenser 46 Preparation battery 48 Preparation battery 50 Control unit 52 Sensor medium 53 Connection medium 54 Circuit 55 Connection medium 56 Circuit 58 Power unit 60 Power unit 62 Heating unit 64 Heating unit 66 Power unit 68 Power unit H1 Heating power H'1 Heating power H2 Heating power H'2 Heating power H'3 Heating power H'4 Heating power heating L1, L2 Center line L3, L4 Connection line C1 Condenser C2 Condenser C3 Condenser Cmed Condenser V Voltage

Claims (15)

one.

 Cooking device with at least two heating units (24.1, 24.2, 24.3; 24.4) that jointly fix a related cooking zone (14) of a cooking plate (12), and a power device (28) that it is provided for the power supply of the heating units (24.1, 24.2, 24.3; 24.4), characterized in that the power device (28) has a differentiating unit (36) which is intended for, in a differentiated heating mode with at least two heating units (24.2, 24.3), differentiate a first positive heating power (H'2) for a first heating unit (24.2) from a second positive heating power (H'3) for a second unit heating (24.3).

2.

 Cooking device according to claim 1, characterized in that at least three heating units (24.1, 24.2, 24.3) are provided and the differentiated heating mode is a heating mode with at least three heating units (24.1, 24.2, 24.3 ).

3.

 Cooking device according to claim 1 or 2, characterized in that at least three heating units (24.1, 24.2, 24.3; 24.4) are provided concentrically arranged with respect to each other and the differentiating unit (36) is provided for, in the Differentiated heating mode, differentiate a first positive heating power (H'2) for a first outdoor heating unit (24.2) from a second positive heating power (H'3; H'4) for a second outdoor heating unit (24.3; 24.4).

Four.

 Cooking device according to claim 3, characterized in that the power device (28) is provided to provide by means of the differentiating unit (36) a minimum positive heating power (H'2) to an intermediate heating unit (24.2).

5.

 Cooking device according to one of the preceding claims, characterized in that the power device (28) has a first power unit (30; 66) for the supply of at least two heating units (24.2, 24.3; 24.2, 24.4 ) and a second power unit (32; 68) different from the first power unit (30) which is intended for the supply of at least a third heating unit (24.1; 24.3).

6.

Cooking device according to claim 5, characterized in that the first power unit (30; 66) is provided for the simultaneous supply of at least two heating units (24.2, 24.3; 24.2, 24.4).

7.

 Cooking device according to claim 5 or 6, characterized in that at least three heating units (24.1, 24.2, 24.3; 24.4) are provided concentrically arranged with respect to each other and the first power unit (30; 66) is provided for the supply of at least two outdoor heating units (24.2, 24.3; 24.2, 24.4).

8.

 Cooking device according to one of claims 5 to 7, characterized in that the first power unit (30; 66) is provided for, in the differentiated heating mode, to supply, by means of the differentiating unit (36) differentiated positive heating powers ( H'2, H'3; H'2, H'4) to at least two heating units (24.2, 24.3; 24.2, 24.4).

9.

Cooking device according to one of claims 5 to 8, characterized in that the differentiating unit (36) has at least one connection means (55) which is intended to connect at least one of the heating units in the differentiated heating mode (24.2) optionally with the first or the second power unit (30, 32).

10.

 Cooking device according to one of the preceding claims, characterized in that the differentiating unit (36) has a differentiating means (38, 39.1, 39.2, 39.3) which is intended to predetermine a fixed ratio at least in the differentiated heating mode between the first and second heating power (H'2, H'3).

eleven.

 Cooking device according to one of the preceding claims, characterized in that the differentiating unit (36) has at least one differentiating means (38; 39.1; 39.3) which is configured as a condenser (Cmed; C3).

12.

 Cooking device according to one of the preceding claims, characterized in that the differentiating unit (36) has a differentiating means (38; 39.3) which is connected at least in the series differentiated heating mode with at least one heating unit ( 24.2; 24.3).

13.

 Cooking device according to one of the preceding claims, characterized in that the differentiating unit (36) has a differentiating means (38) and a connecting means (40) which is provided for a connection and disconnection of the differentiating means (38).

14.

Cooking device according to claim 13, characterized in that the differentiating means (38) is

arranged in a branch (42) that bridges the connection means (40).

fifteen.

 Cooking device according to claim 13 or 14, characterized in that the differentiating unit (36) has at least one other differentiating means (39.1) that is preconnected to the connecting means (40).